1. Department of Mathematics and Statistics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia
2. Department of Applied Statistics and Insurance, Faculty of Commerce, Mansoura University, Mansoura 35516, Egypt
3. Department of Statistics, The University of Azad Jammu and Kashmir, Muzaffarabad, Pakistan
4. Department of Mathematics, Jahangirnagar University, Savar, Dhaka, Bangladesh